from django.core.exceptions import FieldError from django.test import TestCase from .models import Choice, Poll, User class ReverseLookupTests(TestCase): def setUp(self): john = User.objects.create(name="John Doe") jim = User.objects.create(name="Jim Bo") first_poll = Poll.objects.create( question="What's the first question?", creator=john ) second_poll = Poll.objects.create( question="What's the second question?", creator=jim ) Choice.objects.create( poll=first_poll, related_poll=second_poll, name="This is the answer." ) def test_reverse_by_field(self): u1 = User.objects.get( poll__question__exact="What's the first question?" ) self.assertEqual(u1.name, "John Doe") u2 = User.objects.get( poll__question__exact="What's the second question?" ) self.assertEqual(u2.name, "Jim Bo") def test_reverse_by_related_name(self): p1 = Poll.objects.get(poll_choice__name__exact="This is the answer.") self.assertEqual(p1.question, "What's the first question?") p2 = Poll.objects.get( related_choice__name__exact="This is the answer.") self.assertEqual(p2.question, "What's the second question?") def test_reverse_field_name_disallowed(self): """ If a related_name is given you can't use the field name instead """ with self.assertRaises(FieldError): Poll.objects.get(choice__name__exact="This is the answer")